diff --git a/src/callback_manager.cpp b/src/callback_manager.cpp
index 5b5babc..192fe4b 100644
--- a/src/callback_manager.cpp
+++ b/src/callback_manager.cpp
@@ -46,7 +46,7 @@ namespace wren::detail {
 		buff_used += signature.size() + 1;
 
 		assert(m_full_name[m_module_range.start + m_module_range.length] == '\0');
-		assert(m_full_name[m_class_range.start + m_module_range.length] == '\0');
+		assert(m_full_name[m_class_range.start + m_class_range.length] == '\0');
 		assert(m_full_name[m_signature_range.start + m_signature_range.length] == '\0');
 		assert(this->module_name() == module_name);
 		assert(this->class_name() == class_name);